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Reviewed-by: Krzysztof Kozlowski Signed-off-by: Alexis Czezar Torreno --- Changes in v5: - Changed out-en-gpios to enable-gpios. Changes in v4: - Reverted pwm and gpio entries - Added missing power supply properties - Clocks not added back as they were driver specific Changes in v3: - Added allOf and ref to spi-peripheral-props.yaml - Changed additionalProperties to unevaluatedProperties - Added avdd-supply property and added it to required Changes in v1: - Removed clocks, clock-names, pwms, pwm-names, gpio properties - Simplified example to use plain SPI bus --- --- .../devicetree/bindings/iio/dac/adi,ad5706r.yaml | 105 +++++++++++++++++= ++++ MAINTAINERS | 7 ++ 2 files changed, 112 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad5706r.yaml b/D= ocumentation/devicetree/bindings/iio/dac/adi,ad5706r.yaml new file mode 100644 index 0000000000000000000000000000000000000000..19cc744a9f0fc35907de8b8bdd9= f088676620b54 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/adi,ad5706r.yaml @@ -0,0 +1,105 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/dac/adi,ad5706r.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices AD5706R 4-Channel Current Output DAC + +maintainers: + - Alexis Czezar Torreno + +description: | + The AD5706R is a 4-channel, 16-bit resolution, current output + digital-to-analog converter (DAC) with programmable output current + ranges (50mA, 150mA, 200mA, 300mA), an integrated 2.5V voltage + reference, and load DAC, A/B toggle, and dither functions. + + Datasheet: + https://www.analog.com/en/products/ad5706r.html + +properties: + compatible: + enum: + - adi,ad5706r + + reg: + maxItems: 1 + + avdd-supply: + description: Analog power supply (2.9V to 3.6V). + + iovdd-supply: + description: Logic power supply (1.14V to 1.89V). + + pvdd0-supply: + description: Power supply for IDAC0 channel (1.65V to AVDD). + + pvdd1-supply: + description: Power supply for IDAC1 channel (1.65V to AVDD). + + pvdd2-supply: + description: Power supply for IDAC2 channel (1.65V to AVDD). + + pvdd3-supply: + description: Power supply for IDAC3 channel (1.65V to AVDD). + + vref-supply: + description: + Optional external 2.5V voltage reference. If not provided, the + internal 2.5V reference is used. + + pwms: + maxItems: 1 + description: + Optional PWM connected to the LDAC/TGP/DCK pin for hardware + triggered DAC updates, toggle, or dither clock generation. + + reset-gpios: + maxItems: 1 + description: + GPIO connected to the active low RESET pin. If not provided, + software reset is used. + + enable-gpios: + maxItems: 1 + description: + GPIO connected to the active low OUT_EN pin. Controls whether + the current outputs are enabled or in high-Z/ground state. + +required: + - compatible + - reg + - avdd-supply + - iovdd-supply + +allOf: + - $ref: /schemas/spi/spi-peripheral-props.yaml# + +unevaluatedProperties: false + +examples: + - | + #include + + spi { + #address-cells =3D <1>; + #size-cells =3D <0>; + + dac@0 { + compatible =3D "adi,ad5706r"; + reg =3D <0>; + avdd-supply =3D <&avdd>; + iovdd-supply =3D <&iovdd>; + pvdd0-supply =3D <&pvdd>; + pvdd1-supply =3D <&pvdd>; + pvdd2-supply =3D <&pvdd>; + pvdd3-supply =3D <&pvdd>; + vref-supply =3D <&vref>; + spi-max-frequency =3D <50000000>; + pwms =3D <&pwm0 0 1000000 0>; + reset-gpios =3D <&gpio0 10 GPIO_ACTIVE_LOW>; + enable-gpios =3D <&gpio0 12 GPIO_ACTIVE_LOW>; + }; + }; +... diff --git a/MAINTAINERS b/MAINTAINERS index 1251965d70bdfa990c66966cd77f7ab52ae3385f..17a3d2d45fccb9cd3c93fd35666= fb85d17d53cde 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1496,6 +1496,13 @@ W: https://ez.analog.com/linux-software-drivers F: Documentation/devicetree/bindings/iio/adc/adi,ad4851.yaml F: drivers/iio/adc/ad4851.c =20 +ANALOG DEVICES INC AD5706R DRIVER +M: Alexis Czezar Torreno +L: linux-iio@vger.kernel.org +S: Supported +W: https://ez.analog.com/linux-software-drivers +F: Documentation/devicetree/bindings/iio/dac/adi,ad5706r.yaml + ANALOG DEVICES INC AD7091R DRIVER M: Marcelo Schmitt L: linux-iio@vger.kernel.org --=20 2.34.1 From nobody Fri Apr 17 13:12:13 2026 Received: from mx0a-00128a01.pphosted.com (mx0a-00128a01.pphosted.com [148.163.135.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 231AB3ACA74; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20260417-dev_ad5706r-v8-2-ef87dff62b57@analog.com> References: <20260417-dev_ad5706r-v8-0-ef87dff62b57@analog.com> In-Reply-To: <20260417-dev_ad5706r-v8-0-ef87dff62b57@analog.com> To: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley CC: , , , Alexis Czezar Torreno , Andy Shevchenko X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1776414457; l=10898; i=alexisczezar.torreno@analog.com; s=20250213; h=from:subject:message-id; bh=lwYDXiz5aMeTvlc+isWodZWJL4Q+QKxlwJHz07gEZLU=; b=9yaSiYd3XjTjunb68Ne9m77xmXYVnpV4TD7NeO/LNQJ3uiG3+SmkoqpD9CIQjC9teCrl+Rgm2 +otnaaXNMUKAUAo0RGkbXqm0B1pRg4WPtWCr2ntId6wdrSaMGg0CEu5 X-Developer-Key: i=alexisczezar.torreno@analog.com; a=ed25519; pk=XpXmJnRjnsKdDil6YpOlj9+44S+XYXVFnxvkbmaZ+10= X-ADIRuleOP-NewSCL: Rule Triggered X-Authority-Analysis: v=2.4 cv=dpDrzVg4 c=1 sm=1 tr=0 ts=69e1ef12 cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=0sLvza09kfJOxVLZPwjg:22 a=uXIjobp8t2wMuQ0fPvqm:22 a=gAnH3GRIAAAA:8 a=QyXUC8HyAAAA:8 a=VwQbUJbxAAAA:8 a=AZYfSuA7CGiH_G7NWKMA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: Y0KNtMZgXbmS2iRO5xsJjneuFL96T2fS X-Proofpoint-GUID: Y0KNtMZgXbmS2iRO5xsJjneuFL96T2fS X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE3MDA4NCBTYWx0ZWRfX0wyX1OcjwQCb crWt3GThqtwlE2y2usiCI1etQKOrR9NN1WXSMP0JsRgLAsF5Z/JwaT4n2bPb8JkXoNSct1lBm+W Ny2H8ryFdgZKOaURcDcfUOXKpmbnx0kqxcqIA2N3kAFJlxX35e5zVvl9juXhGFZV5pyqdsLcuU5 S3cw3gxJILJfrZEHT0K+HHJlR6BbwZ575qz/zlKhWVzUKPA1X2nI4Ptg2hn1pKHRnEMoCI0E0Hl qJCjilTjn1YJRKmdSs8oo/uHhJWDMpkJ6AZoAHl9WF5AUdLW6g/2SzztSogDPjugJCVTWzuaVFl 98qFRgSRLBFYQShnfOdh3XE6xI7c791h3Vm91kH9S0JZhbxppguU0Ncqa7Q263TKh+ymBE7VX3E 1ixwhq9tUbuulbzWukliTrLU1Z57Twp+bk6E7asJxDtjfTE1NgEuDDwZV5jTkHarJOkOUlrP9R8 ayYQgtzDRJ7FfQQXyHg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-16_04,2026-04-16_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 suspectscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 clxscore=1015 bulkscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604170084 Add support for the Analog Devices AD5706R, a 4-channel 16-bit current output digital-to-analog converter with SPI interface. Features: - 4 independent DAC channels - Hardware and software LDAC trigger - Configurable output range - PWM-based LDAC control - Dither and toggle modes - Dynamically configurable SPI speed Reviewed-by: Andy Shevchenko Signed-off-by: Alexis Czezar Torreno --- Changes in v8: - changed DAC_CODE from BIT(16) to GENMASK(15,0) - removed defines for single/multi byte, replaced with number - adjusted regmap_write to use if/else similar to read() - reverted in_range back to open code equivalent, removed minmax.h Changes in v7: - Moved/added size validation before data access in write()/read() Changes in v6: - Added size validation in regmap_write() - Used &st->tx_buf[0] consistently _be32/be16 calls - Added missing indent in AD5706R_CHAN Changes in v5: - Kconfig: Added select REGMAP_SPI dependency - Headers: Removed device.h, errno.h, string.h; added dev_printk.h - Use IIO_DMA_MINALIGN instead of ARCH_DMA_MINALIGN - Replaced memcpy/memset with put_unaligned_be* for consistency - Added struct device *dev shorthand in probe() - Added newline to error message - Other minor style edits Changes in v4: - Added missing includes - Converted to use regmap with custom SPI bus implementation - Removed driver-specific mutex/guards in favor of regmap locking - Minor style cleanups Changes in v3: - Removed redundant includes, added respective includes of APIs used - Simplified bit manipulation in SPI read/write - Fixed inconsistent trailing commas in device ID tables - Removed zero initialization in spi_device_id Changes in v2: - Removed PWM, GPIO, clock generator, debugfs, regmap, IIO_BUFFER - Removed all custom ext_info sysfs attributes - Simplified to basic raw read/write and read-only scale - SPI read/write can handle multibyte registers --- --- MAINTAINERS | 1 + drivers/iio/dac/Kconfig | 11 ++ drivers/iio/dac/Makefile | 1 + drivers/iio/dac/ad5706r.c | 253 ++++++++++++++++++++++++++++++++++++++++++= ++++ 4 files changed, 266 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 17a3d2d45fccb9cd3c93fd35666fb85d17d53cde..3d7bd98b4d1b55836e40687a9a3= ac9f4935a8acb 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1502,6 +1502,7 @@ L: linux-iio@vger.kernel.org S: Supported W: https://ez.analog.com/linux-software-drivers F: Documentation/devicetree/bindings/iio/dac/adi,ad5706r.yaml +F: drivers/iio/dac/ad5706r.c =20 ANALOG DEVICES INC AD7091R DRIVER M: Marcelo Schmitt diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index db9f5c711b3df90641f017652fbbef594cc1627d..a5a328818233e3d019cddaee369= dd5b7b1529031 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -178,6 +178,17 @@ config AD5624R_SPI Say yes here to build support for Analog Devices AD5624R, AD5644R and AD5664R converters (DAC). This driver uses the common SPI interface. =20 +config AD5706R + tristate "Analog Devices AD5706R DAC driver" + depends on SPI + select REGMAP_SPI + help + Say yes here to build support for Analog Devices AD5706R 4-channel, + 16-bit current output DAC. + + To compile this driver as a module, choose M here: the + module will be called ad5706r. + config AD9739A tristate "Analog Devices AD9739A RF DAC spi driver" depends on SPI diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index 2a80bbf4e80ad557da79ed916027cedff286984b..0034317984985035f7987a74489= 9924bfd4612e3 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_AD5449) +=3D ad5449.o obj-$(CONFIG_AD5592R_BASE) +=3D ad5592r-base.o obj-$(CONFIG_AD5592R) +=3D ad5592r.o obj-$(CONFIG_AD5593R) +=3D ad5593r.o +obj-$(CONFIG_AD5706R) +=3D ad5706r.o obj-$(CONFIG_AD5755) +=3D ad5755.o obj-$(CONFIG_AD5758) +=3D ad5758.o obj-$(CONFIG_AD5761) +=3D ad5761.o diff --git a/drivers/iio/dac/ad5706r.c b/drivers/iio/dac/ad5706r.c new file mode 100644 index 0000000000000000000000000000000000000000..f7872e92dc01df5b4b6a785de1a= 87e6a9974d7b7 --- /dev/null +++ b/drivers/iio/dac/ad5706r.c @@ -0,0 +1,253 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AD5706R 16-bit Current Output Digital to Analog Converter + * + * Copyright 2026 Analog Devices Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* SPI frame layout */ +#define AD5706R_RD_MASK BIT(15) +#define AD5706R_ADDR_MASK GENMASK(11, 0) + +/* Registers */ +#define AD5706R_REG_DAC_INPUT_A_CH(x) (0x60 + ((x) * 2)) +#define AD5706R_REG_DAC_DATA_READBACK_CH(x) (0x68 + ((x) * 2)) + +#define AD5706R_DAC_RESOLUTION 16 +#define AD5706R_DAC_MAX_CODE GENMASK(15, 0) +#define AD5706R_MULTIBYTE_REG_START 0x14 +#define AD5706R_MULTIBYTE_REG_END 0x71 +#define AD5706R_MAX_REG 0x77 + +struct ad5706r_state { + struct spi_device *spi; + struct regmap *regmap; + + u8 tx_buf[4] __aligned(IIO_DMA_MINALIGN); + u8 rx_buf[4]; +}; + +static int ad5706r_reg_len(unsigned int reg) +{ + if (reg >=3D AD5706R_MULTIBYTE_REG_START && reg <=3D AD5706R_MULTIBYTE_RE= G_END) + return 2; + + return 1; +} + +static int ad5706r_regmap_write(void *context, const void *data, size_t co= unt) +{ + struct ad5706r_state *st =3D context; + unsigned int num_bytes; + u16 reg, val; + + if (count !=3D 4) + return -EINVAL; + + reg =3D get_unaligned_be16(data); + val =3D get_unaligned_be16(data + 2); + num_bytes =3D ad5706r_reg_len(reg); + + struct spi_transfer xfer =3D { + .tx_buf =3D st->tx_buf, + .len =3D num_bytes + 2, + }; + + put_unaligned_be16(reg, &st->tx_buf[0]); + + if (num_bytes =3D=3D 1) + st->tx_buf[2] =3D (u8)val; + else if (num_bytes =3D=3D 2) + put_unaligned_be16(val, &st->tx_buf[2]); + else + return -EINVAL; + + return spi_sync_transfer(st->spi, &xfer, 1); +} + +static int ad5706r_regmap_read(void *context, const void *reg_buf, + size_t reg_size, void *val_buf, size_t val_size) +{ + struct ad5706r_state *st =3D context; + unsigned int num_bytes; + u16 reg, cmd, val; + int ret; + + if (reg_size !=3D 2 || val_size !=3D 2) + return -EINVAL; + + reg =3D get_unaligned_be16(reg_buf); + num_bytes =3D ad5706r_reg_len(reg); + + /* Full duplex, device responds immediately after command */ + struct spi_transfer xfer =3D { + .tx_buf =3D st->tx_buf, + .rx_buf =3D st->rx_buf, + .len =3D 2 + num_bytes, + }; + + cmd =3D AD5706R_RD_MASK | (reg & AD5706R_ADDR_MASK); + put_unaligned_be16(cmd, &st->tx_buf[0]); + put_unaligned_be16(0, &st->tx_buf[2]); + + ret =3D spi_sync_transfer(st->spi, &xfer, 1); + if (ret) + return ret; + + /* Extract value from response (skip 2-byte command echo) */ + if (num_bytes =3D=3D 1) + val =3D st->rx_buf[2]; + else if (num_bytes =3D=3D 2) + val =3D get_unaligned_be16(&st->rx_buf[2]); + else + return -EINVAL; + + put_unaligned_be16(val, val_buf); + + return 0; +} + +static int ad5706r_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct ad5706r_state *st =3D iio_priv(indio_dev); + unsigned int reg, reg_val; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + reg =3D AD5706R_REG_DAC_DATA_READBACK_CH(chan->channel); + ret =3D regmap_read(st->regmap, reg, ®_val); + if (ret) + return ret; + + *val =3D reg_val; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + *val =3D 50; + *val2 =3D AD5706R_DAC_RESOLUTION; + return IIO_VAL_FRACTIONAL_LOG2; + default: + return -EINVAL; + } +} + +static int ad5706r_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct ad5706r_state *st =3D iio_priv(indio_dev); + unsigned int reg; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (val < 0 || val > AD5706R_DAC_MAX_CODE) + return -EINVAL; + + reg =3D AD5706R_REG_DAC_INPUT_A_CH(chan->channel); + return regmap_write(st->regmap, reg, val); + default: + return -EINVAL; + } +} + +static const struct regmap_bus ad5706r_regmap_bus =3D { + .write =3D ad5706r_regmap_write, + .read =3D ad5706r_regmap_read, + .reg_format_endian_default =3D REGMAP_ENDIAN_BIG, + .val_format_endian_default =3D REGMAP_ENDIAN_BIG, +}; + +static const struct regmap_config ad5706r_regmap_config =3D { + .reg_bits =3D 16, + .val_bits =3D 16, + .max_register =3D AD5706R_MAX_REG, +}; + +static const struct iio_info ad5706r_info =3D { + .read_raw =3D ad5706r_read_raw, + .write_raw =3D ad5706r_write_raw, +}; + +#define AD5706R_CHAN(_channel) { \ + .type =3D IIO_CURRENT, \ + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .output =3D 1, \ + .indexed =3D 1, \ + .channel =3D _channel, \ +} + +static const struct iio_chan_spec ad5706r_channels[] =3D { + AD5706R_CHAN(0), + AD5706R_CHAN(1), + AD5706R_CHAN(2), + AD5706R_CHAN(3), +}; + +static int ad5706r_probe(struct spi_device *spi) +{ + struct device *dev =3D &spi->dev; + struct iio_dev *indio_dev; + struct ad5706r_state *st; + + indio_dev =3D devm_iio_device_alloc(dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st =3D iio_priv(indio_dev); + st->spi =3D spi; + + st->regmap =3D devm_regmap_init(dev, &ad5706r_regmap_bus, + st, &ad5706r_regmap_config); + if (IS_ERR(st->regmap)) + return dev_err_probe(dev, PTR_ERR(st->regmap), + "Failed to init regmap\n"); + + indio_dev->name =3D "ad5706r"; + indio_dev->info =3D &ad5706r_info; + indio_dev->modes =3D INDIO_DIRECT_MODE; + indio_dev->channels =3D ad5706r_channels; + indio_dev->num_channels =3D ARRAY_SIZE(ad5706r_channels); + + return devm_iio_device_register(dev, indio_dev); +} + +static const struct of_device_id ad5706r_of_match[] =3D { + { .compatible =3D "adi,ad5706r" }, + { } +}; +MODULE_DEVICE_TABLE(of, ad5706r_of_match); + +static const struct spi_device_id ad5706r_id[] =3D { + { "ad5706r" }, + { } +}; +MODULE_DEVICE_TABLE(spi, ad5706r_id); + +static struct spi_driver ad5706r_driver =3D { + .driver =3D { + .name =3D "ad5706r", + .of_match_table =3D ad5706r_of_match, + }, + .probe =3D ad5706r_probe, + .id_table =3D ad5706r_id, +}; +module_spi_driver(ad5706r_driver); + +MODULE_AUTHOR("Alexis Czezar Torreno "); +MODULE_DESCRIPTION("AD5706R 16-bit Current Output DAC driver"); +MODULE_LICENSE("GPL"); --=20 2.34.1